In this study, the addition of lignin granules to the asphalt binder PAC 30/45 and its effects on short-term aging were investigated. Penetration, softening point, and ductility tests were conducted before and after RTFOT (Rolling Thin Film Oven Test). Laboratory results revealed that incorporating lignin into the asphalt binder significantly improved aging resistance compared to the pure binder. This was evidenced by reduced penetration, increased consistency, higher softening point, and satisfactory ductility after aging. Lignin also decreased the binder's sensitivity to temperature variation, indicated by a Thermal Susceptibility Index (TSI) closer to zero. While improvements were not as pronounced as in previous studies with PAC 50/70, adding 3% lignin showed benefits compared to the unmodified binder, whereas 6% lignin made PAC 30/45 more susceptible to oxidation. It is concluded that lignin can enhance the rheological properties of PAC 30/45, increasing its stiffness, durability, and aging resistance. Further exploration of lignin concentrations below 3% and above 6% is recommended to better understand oxidative effects on the 30/45 binder and confirm the benefits of minor additions.